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Finding the Fourth Proportional to 38.98, 53.78 and 26.70

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Solution

The fourth proportional to 38.98, 53.78 and 26.70 is: 36.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.98 : 53.78 = 26.70 : x
  2. Step 2: Convert to fraction form
    38.98/53.78 = 26.70/x
  3. Step 3: Cross multiply
    38.98x = 53.78 × 26.70
  4. Step 4: Simplify right side
    38.98x = 1,435.93
  5. Step 5: Solve for x
    x = 1,435.93/38.98
  6. Step 6: Final answer
    x = 36.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.